I had never heard of Geronimo Stilton before having kids, and just randomly stumbled across these CDs at the library when planning a road trip. These were a big hit and we started playing them in the evening at bedtime.
The concept is that Geronimo Stilton is a mouse and a newspaper editor who winds up in zany adventures with his sister and nephew and others. Geronimo is a bit of a nebbish and a reluctant hero, making the stories comical.
There are something like 30 stories that have been read and recorded on CDs, in collections of 2 or 3. The narrator of the first few CDs is Edward Herrmann and of the others is Bill Lobley. Lobley in particular is a very skilled voice actor and he makes the characters and story very entertaining, enough to engage parents as well as children.
It turns out that Geronimo Stilton is practically a media empire, with dozens of chapter books, comic books, graphic novels, audio CDs, and a TV cartoon. It was fun for our kids to hear the stories first on audio, and later to read the comic versions, putting faces to the characters they had become familiar with.